Hauxfan, a buddy and I built one of those years back. He owns an ornamental fabrication business in Ca. and we built it together one weekend. It uses the widest news-print leftover rolls winding from one spindle from top to one at the bottom. That allowed us to save all our patterns to re-check numbers later. We built this one to operate manually by winding a new sheet in place. We also came up with an idea for one that operated on a 12 volt system to wind a new sheet into proper place by remote control. There wasn't much enthusiasm for potential sales for such an expensive "pattern board", we didn't continue the project. Getting the news print re-worked with a color dot in the correct position was way to expensive for sales also. We used a can of black paint for an aiming dot on the manual machine we did use. Worked great and we shot a LOT of patterns testing different loads, wads and shot sizes. Hap